docstr: Supports subindexing of the matrix this LinearOperator represents. This may return either another
  :obj:`~linear_operator.operators.LinearOperator` or a :obj:`torch.tensor` depending on the exact implementation.
docstr_tok: ["Supports","subindexing","of","the","matrix","this","LinearOperator","represents",".","This","may","return","either","another",":","obj",":","`","~linear_operator.operators.LinearOperator","`","or","a",":","obj",":","`","torch.tensor","`","depending","on","the","exact","implementation","."]
code: def __getitem__(self, index):
      """
      Supports subindexing of the matrix this LinearOperator represents. This may return either another
      :obj:`~linear_operator.operators.LinearOperator` or a :obj:`torch.tensor` depending on the exact implementation.
      """
      # Process the index
      index = index if isinstance(index, tuple) else (index,)
      # Special case for the most common case: [..., slice, slice]
      if (
          len(index) == 3
          and index[0] is Ellipsis
          and isinstance(index[1], slice)
          and isinstance(index[2], slice)
      ):
          _, row_index, col_index = index
          batch_indices = [slice(None, None, None)] * (self.dim() - 2)
          return self._getitem(row_index, col_index, *batch_indices)
      else:
          return super().__getitem__(index)
  
imports: import functools
  from typing import Callable
  import torch
  from linear_operator import LinearOperator, to_linear_operator
  from linear_operator.utils.getitem import _noop_index
  from ..None import beta_features, settings
  from ..utils import deprecation
  from ..utils.memoize import cached
label_desc: Use image node_id 19 for calling the LazyEvaluatedKernelTensor obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self, super